1911] HuttkowsM, studies in Tetragoneuria. 127 



This species can be regarded as an intermediate between 

 cynosura and spmigera, to both of which it shows many points 

 of similarity. The male is easily distinguished, while the female 

 presents some difficulty, though separable by the longer 

 appendages. 



Tetragoneuria spinigera Selys. 



Very much like the preceding species. 



T-spot always present, the pile on the sides of the thorax much 

 mixed with brown. Altogether the insect presents a darker appear- 

 ance than those of the cynosura series. 



Wings of the male with color like that of cynosura c2. The 

 female similar, but with the veins in the anal field, near the base 

 only and not extending out to the triangle, edged with brown. 



Length of abdomen 30 to 34 mm., hind wing 30 to 33 mm. 



The following material is at hand : 



1. $ Wis., Milwaukee Museum. 



2. $ Milwaukee Co., 1900, F. Rauterberg ; Milwaukee Museum. 



3. $ St. Croix Dam, Douglas Co., Wis., July 17-22, 1909; Mil- 



waukee Museum. 



4. $ Wis., Milwaukee Museum. 



5. $ Dane Co., Wis., June, 1890, E. T. Owen; coll. A. N. S. 



Phila. 



6. $ Same. 



7. $ Manchester, Me., June 21, 1890, Miss M. Wadsworth; 



coll. Calvert. 



8. $ Seattle. Wash., June 15th, 1894, O. R. Johnson; coll. 



Calvert. 



9. $ Langford, L. B. C, July 20, 1902. R. Osborne: coll. 



Williamson. 



10. $ Same. 



11. $ No label; coll. Williamson. 



12. $ Saranac Tnn., N. Y., June 14, J. Needham ; coll. 



Williamson. 



13. $ Same. 



14. $ Clear Lake, Ind., June 12, 1904, Deam ; coll. Williamson. 



